Girl saw me in mirror, then she turned around and smiled?

Anonymous
Me and my sister were walking out of the co-ed locker rooms at our job and this girl was walking in front of us. When we were walking we walked toward a big mirror that covered the wall. My sister made a joke so I started smiling. As I was smiling I looked at her in the mirror. She looked at me and smiled, then she turned around and looked at me and smiled. When she turned around I smiled too. There's a pretty good chance she likes me right? I've caught her looking once before but I looked away. Why would a girl be so obvious? What should I do when I see her again? Thanks!
Girl saw me in mirror, then she turned around and smiled?
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